Screen Space Clipping
Screen Space effects such as Shadows are a technique (borrowed from game rendering) to improve the visual look of a render without having to spend too much additional time considering features that are not visible. As such, it is a trade-off between realism and fast renders. Only 'visible' components are considered and so there can be noticeable issues with elements towards the edges of the visible frame.
One way to resolve this is to render an additional border around your frame by increasing the camera Sensor Size. This will have the effect of rendering additional area around the frame without affecting the perspective of the camera. The additional space will be used for rendering screen space reflections, etc. and you can then use the Compositor to clip the unwanted section from the final render.